Daniel-Nikpayuk_SICP-Solutions/Chapter 3/3.1/exercise-3.06/exercise.lsp
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;; Copyright 2015 Daniel Nikpayuk
;;
;; This file is part of SICP Solutions.
;;
;; SICP Solutions is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License
;; as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
;;
;; SICP Solutions is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
;; of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License along with SICP Solutions. If not, see
;; <http://www.gnu.org/licenses/>.
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(define (make-rand x)
 (lambda (message)
  (cond
   ((eq? message 'generate) (random x))
   ((eq? message 'reset) (lambda (new-x) (set! x new-x) "reset."))
   (else (error "Unknown parameter!" message))
  )
 )
)

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(define rand (make-rand 100))
(rand 'generate)
(rand 'generate)
(rand 'generate)

((rand 'reset) 10)
(rand 'generate)
(rand 'generate)
(rand 'generate)

